The Orbit of 16 Cygni AB

Details The Orbit of 16 Cygni AB The Orbit of 16 Cygni AB

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasp..111..321h&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 111, Issue 757, pp. 321-334.

Astronomy and Astrophysics

Astronomy

21

Binary Stars, Orbits, Stars: Planetary Systems, Stars: Individual: Constellation Name: 16 Cygni

Scientific paper

The high orbital eccentricity of the planet around 16 Cygni B may have been induced by the companion star, 16 Cygni A, but only if the stellar binary has sufficiently small periastron distance. The long period of the stellar binary, ~3x10^4 yr, implies that less than 1% of the orbit has transpired since its first astrometric measurements in 1830. Therefore, we compute the orbit from the measured instantaneous velocity and position vectors, based on new precise Doppler and astrometric data, along with the Hipparcos parallax. The only unknown parameter is the separation between AB along the line of sight, constrained by the demand that the orbit be bound, which leads to a family of possible orbits for 16 Cygni AB. The physically plausible orbits have 18,200 yr

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